Device for reduction and enlargement control



E. F. KINZLER.

DEVICE FOR REDUCTION AND ENLARGEMENT CONTROL.

APPLICATIQII FILED IAY I5. I92I.

Patented Dee,12,1922.

M fw@ E@ n H4100 Il; vrav IIIIIIIIIIIIIIIIIIII IIIIIII|IIIIII||||||||| n w l* Patented Dec. 12, 1922. l

l UNITED .STATES 1,438,498 PATENT OFFICE.

EDWARD F. KINZLEBI, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOB 0F ONE-HALF TO ROBERT RAWSTHOBNE, JB., 0F

PITTSBURGH, PENNSYLVANIA.

DEVICE FOB REDUCTION AND ENLARGEMENT CONTROL.

Application led Hay 16,

clear, and exact description thereof.

My invention relates to a reduction and enlargement controller.

In photoengraving establishments where all sizes of drawings and copies are received to be rephotographed to certaln 'larger or smaller sizes for process engravings, etc., it has been customary heretofore to obtain the exact reduction or enlargement number by the slide rule and equlvalent decimal chart, which is a very tedious and slow operation. Each drawing or copy is marked with the reduction or enlargement number, and after all the numbers -have been obtained all the copies or drawings of like number are placed on one large board and can be photographed at one time, as the same adjustment of the camera will do for all having the same reduction or enlargement number.

The object of my invention is to provide a device by means of which the reduction and enlargement numbers may be secured in a few moments, thereby doing away with the slide rule and decimal chart, and all the time and labor occasioned thereby.

To these ends my invention comprises the novel features hereinafter -set forth and claimed.

In the accompanying drawings Fig. 1 is a plan view of my invention; and Fig. 2 is a fragmentary v1ew of the base plate showing the setting edge of the plate.

In the drawing the numeral 2 designates a suitable base-'board which may be formed of metal, wood or any other suitable material, having the guide-way 3 formed therein to receive the T-square 4, the connection between said square and said guide being preferably of the ordinary dovetailed type, so that said square is free to be moved readily back and forth in said guide.

The square 4 may be formed o any suitable material, but preferably of some metal which will not rust or corrode, and on which the marks of the scale will stand out clear and defined. Along the arm 4 of the 1921. Serial N0. 470,157.

square 4 which moves in the guide 3 is the copy-size scale, and in the illustration of my invention there is one row of figures from zero t0 12, representing inches and the fractions thereof. Above this line of figures are figures running from zero to 24, designating the inches as before. The arm 5 of the square has the reduction or enlargement size scale, and this scale has, like the copy-size scale, two corresponding sets of like figures.

Pivotally mounted at 6 on the base 2 is the indicator 7 with the arms 8 and 9. The

Varm 8 is provided with the beveled edge 10 for convenience in adjusting said arm with reference to the sub-divisions of the scales on the square 4.

The base-board 2 is cut away on an angle as at 2*L adjacent the pivotal point 6 to provide a setting edge so that when the indicator arm 8 is in the position shown in the drawing, with the pivotal point 6. in line with the scale line of the copy-size scale, the beveled edge 10 of said arm 8 will coincide with the edge of said cut-away portion, and in this way the adjustment lof the indicator is made with ease and accuracy. l

The arm'9 of the indicator has the opening 11 formed at its outer end which acts as a window through which the figures rep resenting the reduction and enlargement numbers may be observed. At the opposite ends of the opening 11 are the lines 13 and 14 which are brought into register with the lines indicating the reduction and enlargement numbers, and the neutral position of the arm 9 of the indicator is indicated by the line 15. The lines indicating the reduction and enlargement numbers are supplied with numerals from 1 on up.

Where it is desired to secure the indicator in itsvadjusted position the board 2 may be provided with the curved `Tslot 16 within which the head 17 of the bolt 18 fits. A thumb-nut y19 is provided for tightening up the bolt to retain the indicator in place.

Where the drawing or copy to be reduced in size is, for example, 7 inches in length, and it is desired to reduce it to 5 inches, the square 4 is' moved to the right until the line marked 7 in the lower line of the copy-size scale is in line with the pivotal point 6, whereupon-the indicator is then moved until the beveled edge 10 of arm 8 coincides with the line marked 5 in the lower line of figures on the arm 5 of the s uare, as clearly indicated in the drawing. his will bring the arm 9 of the indicator to the osition indicated 'in the drawing, and t rough the opening 11 it will be observed that the l1ne 14 coincides with the line numbered 105 so that the reduction number for the drawing to be reduced from 7 inches tol 5 inches will be 105. The drawing is accordingly marked with the numeral 105. j

Suppose, for instance, a drawing 1152 inches wide is to be reduced to 5% inches. The square would be moved until the line representing the 11% inches is in line with pivotal point 6, whereupon the arm 8 is 'moved until its beveled edge 10 touches the outer end of the 5% inch mark on the reduction or enlargement scale', and the arm 9 will have its opening over Athe number 7 9 of the reduction numbers. If now it is desired to find the height of the reduced drawing, the indicator is retained at the same position, but the square is slid to the size which corresponds to the height of the drawing, say 6 inches, and the indicator arm 8 will give the correct reduced height. To obtain the enlargement number the j same operation is followed` except that instead of movingthe arm 8 of the indicator upwardly it is moveddownwardly to throw the arm 9 of the indicator over on to the enlargement numbers.

In this manner where there are a number of drawings of all sizes, the reduction number or enlargement number may be obtained in a few seconds, and each drawing has its number applied thereto, so that after all the numbers have been applied the drawings are then classified, the drawings of the same numbers being placed on the same boards to be photographed with one operation of the camera.

iWhile I have described my invention with reference to obtaining the reduction or enlargement numbers of drawings or copies for photoengraved work, it is apparent that the invention may have a wide application for use by any one desiring to know vthe exact reduction or enlargement number of any article for reproduction or otherwise.V

If the subject is over 12 inches it is divided by 2, 3 or 4, according to the desired size wanted, and the same reduction or enlargement number is obtained. For instance,

a `6 inch drawing reduced to inches is just numbers, a square movably mounted on said board having a copy-size scale on one arm and reductlon or enlargement size scale cn the other arm, an indicator pivotally mount-y ed on said board adjacent said square, one of the arms of said indicator extending over said scale on said board, and the other over said second-named arm of said square.

2. In a device ofthe character described, the combination of a board having a scale representing reduction and enlargement numbers, a square movably mounted on said board having a copy-size scale on one arm and reduction or enlargement size scale on the other arm, an indicator pivotally mounted on said board adjacent said square, one of the arms of said indicator extending over said scale on said board and having an opening at its outer end, and the other arm of said indicator extending over said secondnamed arm of said square.

3. In a device of the character described, the combination of a board having a Scale representing reduction and enlargement numbers, a square movably mounted on said board having a copy-size scale on one arm and a reduction or enlargement size scale on the other arm, an indicator pivotally' mounted on said board adjacent to the arm of said square,'said board being cut away adjacent to said arm of said square to form an angle at its edge, one of the arms of said indicator extending over said scale on said board, and the other arm of said indicator extending over said second-named arm of said square andadapted to coincide with said angular edge of said board.

In testimony whereof, I, the said EDWARD F. KINZLER, have hereunto set my hand. y EDWARD F. KINZLER. Witnesses:

RoBT. D. TOTTEN, JOHN F. WILL. 

